Alert archive / Illinois / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 166, NWS St. Louis, MO

September 4, 20175 counties in Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Sep 4, 2017, 6:11 PM CDT for 5 counties in Illinois. It was in force for 64 min. 10 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Sep 4, 2017, 6:11 PM CDT (23:11 UTC)
Expired: Sep 4, 2017, 7:15 PM CDT
In force: 64 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bond County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Montgomery County, IL

The radar

The St Louis radar (KLSX), 77 km from the middle of the area, began a volume at 23:11 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Sep 4, 6:14 PM CDT	HAIL 0.25	1 Nne White City, IL	PER HAM RADIO.
Sep 4, 6:14 PM CDT	HAIL 0.25	4 Se Gillespie, IL	PER HAM RADIO
Sep 4, 6:15 PM CDT	TSTM WND GST 58	Litchfield, IL
Sep 4, 6:27 PM CDT	HAIL 0.88	Bunker Hill, IL
Sep 4, 6:33 PM CDT	HAIL 2	2 E Bunker Hill, IL
Sep 4, 6:33 PM CDT	HAIL 2	2 S Pruett, IL
Sep 4, 6:53 PM CDT	HAIL 0.25	Wood River, IL
Sep 4, 6:59 PM CDT	HAIL 0.88	Wood River, IL
Sep 4, 7:05 PM CDT	TSTM WND GST 60	Wood River, IL	DEBRIS BLOWN FROM FRONT OF THE STORE AND CARTS BLOWN ACROSS PARKING LOT AND FLIPPED
Sep 4, 7:05 PM CDT	TSTM WND GST 60	Wood River, IL	DEBRIS BLOWN FROM FRONT OF THE STORE AND CARTS BLOWN ACROSS PARKING LOT AND FLIPPED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Sep 4, 4:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.2 hours before the alert went out and 171 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1674 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 220 m²/s²
0-3 km storm-relative helicity: 241 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

671 
WUUS53 KLSX 042311
SVRLSX
ILC005-083-117-119-135-050015-
/O.NEW.KLSX.SV.W.0166.170904T2311Z-170905T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
611 PM CDT MON SEP 4 2017

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Northwestern Bond County in south central Illinois...
  Northern Madison County in southwestern Illinois...
  Southern Macoupin County in southwestern Illinois...
  East central Jersey County in southwestern Illinois...
  Southwestern Montgomery County in south central Illinois...

* Until 715 PM CDT.

* At 611 PM CDT, severe thunderstorms were located along a line
  extending from near Litchfield to near Brighton, moving southeast
  at 20 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Alton, Godfrey, Wood River, Bethalto, Greenville, Litchfield,
  Staunton, Gillespie, East Alton, Brighton, Mount Olive, South
  Roxana, Bunker Hill, Benld, Roxana, Hartford, Worden, Livingston,
  Alhambra and Shipman.

This includes Interstate 55 in Illinois between exits 30 and 52.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3888 8938 3881 9012 3885 9011 3888 9017
      3915 9025 3922 8960
TIME...MOT...LOC 2311Z 325DEG 20KT 3914 8969 3910 9018 

HAIL...1.00IN
WIND...60MPH
 
$$

Kanofsky

3 follow-up statements

559 
WWUS53 KLSX 042326
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
626 PM CDT MON SEP 4 2017

ILC005-083-117-119-135-050015-
/O.CON.KLSX.SV.W.0166.000000T0000Z-170905T0015Z/
Bond IL-Madison IL-Macoupin IL-Jersey IL-Montgomery IL-
626 PM CDT MON SEP 4 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR NORTHWESTERN BOND COUNTY IN SOUTH CENTRAL ILLINOIS...NORTHERN
MADISON...SOUTHERN MACOUPIN...EAST CENTRAL JERSEY COUNTIES IN
SOUTHWESTERN ILLINOIS AND SOUTHWESTERN MONTGOMERY COUNTIES IN SOUTH
CENTRAL ILLINOIS...

At 625 PM CDT, severe thunderstorms were located along a line
extending from near Mount Olive to Brighton, moving east at 25 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts. 

SOURCE...The Litchfield ASOS reported a 57 mph wind gust. 

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees. 

Locations impacted include...
Alton, Godfrey, Wood River, Bethalto, Greenville, Litchfield,
Staunton, Gillespie, East Alton, Brighton, Mount Olive, South Roxana,
Bunker Hill, Benld, Roxana, Hartford, Worden, Livingston, Alhambra
and Shipman.

This includes Interstate 55 in Illinois between exits 30 and 52.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3888 8938 3881 9012 3885 9011 3888 9017
      3915 9025 3922 8960
TIME...MOT...LOC 2325Z 270DEG 20KT 3908 8963 3904 9012 

HAIL...1.50IN
WIND...60MPH
 
$$

Kanofsky

409 
WWUS53 KLSX 042339
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
639 PM CDT MON SEP 4 2017

ILC005-083-117-119-135-050015-
/O.CON.KLSX.SV.W.0166.000000T0000Z-170905T0015Z/
Bond IL-Madison IL-Macoupin IL-Jersey IL-Montgomery IL-
639 PM CDT MON SEP 4 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR NORTHWESTERN BOND COUNTY IN SOUTH CENTRAL ILLINOIS...NORTHERN
MADISON...SOUTHERN MACOUPIN...EAST CENTRAL JERSEY COUNTIES IN
SOUTHWESTERN ILLINOIS AND SOUTHWESTERN MONTGOMERY COUNTIES IN SOUTH
CENTRAL ILLINOIS...

At 639 PM CDT, severe thunderstorms were located along a line
extending from Sorento to near Dorsey, moving southeast at 25 mph.

HAZARD...Two inch hail and 60 mph wind gusts. 

SOURCE...Trained weather spotters. Two inch hail was reported east 
         of Bunker Hill...and the Litchfield AWOS reported a 58 mph 
         wind gust associated with this storm.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees. 

Locations impacted include...
Alton, Godfrey, Wood River, Bethalto, Greenville, Litchfield,
Staunton, Gillespie, East Alton, Brighton, Mount Olive, South Roxana,
Bunker Hill, Benld, Roxana, Hartford, Worden, Livingston, Alhambra
and Shipman.

This includes Interstate 55 in Illinois between exits 30 and 52.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3888 8938 3881 9012 3885 9011 3888 9017
      3911 9024 3920 8958
TIME...MOT...LOC 2339Z 325DEG 20KT 3902 8958 3898 9007 

HAIL...2.00IN
WIND...60MPH
 
$$

Kanofsky

605 
WWUS53 KLSX 050021
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
721 PM CDT MON SEP 4 2017

ILC005-083-117-119-135-050030-
/O.EXP.KLSX.SV.W.0166.000000T0000Z-170905T0015Z/
Bond IL-Madison IL-Macoupin IL-Jersey IL-Montgomery IL-
721 PM CDT MON SEP 4 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BOND COUNTY IN
SOUTH CENTRAL ILLINOIS...NORTHERN MADISON...SOUTHERN MACOUPIN...EAST
CENTRAL JERSEY COUNTIES IN SOUTHWESTERN ILLINOIS AND SOUTHWESTERN
MONTGOMERY COUNTIES IN SOUTH CENTRAL ILLINOIS HAS EXPIRED...
    
The storms which prompted the warning have moved out of the area.
Therefore the warning has been allowed to expire.  However gusty
winds and heavy rain are still possible with these thunderstorms.

A severe thunderstorm watch remains in effect until 1000 PM CDT for
south central and southwestern Illinois...and east central Missouri.

Remember, a Severe Thunderstorm Warning still remains in effect for
portions of Madison...Bond...Clinton...and St. Clair Counties.

LAT...LON 3888 8938 3881 9012 3885 9011 3888 9017
      3911 9024 3920 8958
TIME...MOT...LOC 0020Z 325DEG 20KT 3885 8943 3881 8992 

$$

Kanofsky

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 4, 4:25 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Macoupin, Montgomery	65 min
Sep 4, 5:15 PM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin, Montgomery	60 min
Sep 4, 6:53 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison, Saint Clair	82 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2017 Every severe thunderstorm warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.